feat: hello world + minimal CI

.github/workflows/ci.yaml

@@ -0,0 +1,23 @@
+
+### 3) 配置最小 CI（GitHub Actions，~5–10 分钟）
+name: CI
+on:
+  push:
+    branches: [ main, "feature/**" ]
+  pull_request:
+    branches: [ main ]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+      - run: pip install -r requirements.txt || true
+      - run: |
+          if [ -f requirements.txt ]; then
+            pytest -q
+          else
+            python -m src.app
+          fi

.vscode/settings.json

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+{
+    "python-envs.defaultEnvManager": "ms-python.python:conda",
+    "python-envs.defaultPackageManager": "ms-python.python:conda",
+    "python-envs.pythonProjects": []
+}

README.md

@@ -1,2 +1,9 @@
 # DevOps
 跑通最小 DevOps 流程（Hello World）PR+CI+Release+重新克隆运行成功
+# Hello World (DevOps Flow)
+
+![CI](https://github.com/chenshming/DevOps/actions/workflows/ci.yml/badge.svg)
+
+## Run
+```bash
+python -m src.app

src/app.py

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+# src/app.py
+def main():
+    print("Hello, world")
+
+if __name__ == "__main__":
+    main()

tests/requirement.txt

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+pytest==8.2.0

tests/test_app.py

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+from io import StringIO
+from contextlib import redirect_stdout
+from src.app import main
+
+def test_main_prints_hello_world():
+    buf = StringIO()
+    with redirect_stdout(buf):
+        main()
+    assert buf.getvalue().strip() == "Hello, world"